WRONG! you just keep doing it that way, I ain't gonna!

On a heavy recoiling DR you should fire the left barrel (or rear trigger) FIRST. If you don't there is very likely a double discharge in your future. If you pull the front trigger first with heavy recoil, the finger can be pulled/bounced off and hit the rear (hot) trigger, and you get BANG BANG.

OUCH OUCH OUCH